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<pre><span class="sourceLineNo">001</span>package serp.bytecode;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.io.*;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.util.*;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>import serp.bytecode.lowlevel.*;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import serp.bytecode.visitor.*;<a name="line.7"></a>
<span class="sourceLineNo">008</span><a name="line.8"></a>
<span class="sourceLineNo">009</span>/**<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Abstract superclass for all bytecode entities that hold attributes.<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * @author Abe White<a name="line.12"></a>
<span class="sourceLineNo">013</span> */<a name="line.13"></a>
<span class="sourceLineNo">014</span>public abstract class Attributes implements BCEntity {<a name="line.14"></a>
<span class="sourceLineNo">015</span> /**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Return all the attributes owned by this entity.<a name="line.16"></a>
<span class="sourceLineNo">017</span> *<a name="line.17"></a>
<span class="sourceLineNo">018</span> * @return all owned attributes, or empty array if none<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span> public Attribute[] getAttributes() {<a name="line.20"></a>
<span class="sourceLineNo">021</span> Collection attrs = getAttributesHolder();<a name="line.21"></a>
<span class="sourceLineNo">022</span> return (Attribute[]) attrs.toArray(new Attribute[attrs.size()]);<a name="line.22"></a>
<span class="sourceLineNo">023</span> }<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span> /**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Return the attribute with the given name. If multiple attributes<a name="line.26"></a>
<span class="sourceLineNo">027</span> * share the name, which is returned is undefined.<a name="line.27"></a>
<span class="sourceLineNo">028</span> */<a name="line.28"></a>
<span class="sourceLineNo">029</span> public Attribute getAttribute(String name) {<a name="line.29"></a>
<span class="sourceLineNo">030</span> Collection attrs = getAttributesHolder();<a name="line.30"></a>
<span class="sourceLineNo">031</span> Attribute attr;<a name="line.31"></a>
<span class="sourceLineNo">032</span> for (Iterator itr = attrs.iterator(); itr.hasNext();) {<a name="line.32"></a>
<span class="sourceLineNo">033</span> attr = (Attribute) itr.next();<a name="line.33"></a>
<span class="sourceLineNo">034</span> if (attr.getName().equals(name))<a name="line.34"></a>
<span class="sourceLineNo">035</span> return attr;<a name="line.35"></a>
<span class="sourceLineNo">036</span> }<a name="line.36"></a>
<span class="sourceLineNo">037</span> return null;<a name="line.37"></a>
<span class="sourceLineNo">038</span> }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> /**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * Return all attributes with the given name.<a name="line.41"></a>
<span class="sourceLineNo">042</span> *<a name="line.42"></a>
<span class="sourceLineNo">043</span> * @return the matching attributes, or empty array if none<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span> public Attribute[] getAttributes(String name) {<a name="line.45"></a>
<span class="sourceLineNo">046</span> List matches = new LinkedList();<a name="line.46"></a>
<span class="sourceLineNo">047</span> Collection attrs = getAttributesHolder();<a name="line.47"></a>
<span class="sourceLineNo">048</span> Attribute attr;<a name="line.48"></a>
<span class="sourceLineNo">049</span> for (Iterator itr = attrs.iterator(); itr.hasNext();) {<a name="line.49"></a>
<span class="sourceLineNo">050</span> attr = (Attribute) itr.next();<a name="line.50"></a>
<span class="sourceLineNo">051</span> if (attr.getName().equals(name))<a name="line.51"></a>
<span class="sourceLineNo">052</span> matches.add(attr);<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<a name="line.53"></a>
<span class="sourceLineNo">054</span> return (Attribute[]) matches.toArray(new Attribute[matches.size()]);<a name="line.54"></a>
<span class="sourceLineNo">055</span> }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span> /**<a name="line.57"></a>
<span class="sourceLineNo">058</span> * Set the attributes for this entity; this method is useful for importing<a name="line.58"></a>
<span class="sourceLineNo">059</span> * all attributes from another entity. Set to null or empty array if none.<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span> public void setAttributes(Attribute[] attrs) {<a name="line.61"></a>
<span class="sourceLineNo">062</span> clearAttributes();<a name="line.62"></a>
<span class="sourceLineNo">063</span> if (attrs != null) <a name="line.63"></a>
<span class="sourceLineNo">064</span> for (int i = 0; i < attrs.length; i++)<a name="line.64"></a>
<span class="sourceLineNo">065</span> addAttribute(attrs[i]);<a name="line.65"></a>
<span class="sourceLineNo">066</span> }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span> /**<a name="line.68"></a>
<span class="sourceLineNo">069</span> * Import an attribute from another entity, or make a copy of one<a name="line.69"></a>
<span class="sourceLineNo">070</span> * on this entity.<a name="line.70"></a>
<span class="sourceLineNo">071</span> */<a name="line.71"></a>
<span class="sourceLineNo">072</span> public Attribute addAttribute(Attribute attr) {<a name="line.72"></a>
<span class="sourceLineNo">073</span> Attribute newAttr = addAttribute(attr.getName());<a name="line.73"></a>
<span class="sourceLineNo">074</span> newAttr.read(attr);<a name="line.74"></a>
<span class="sourceLineNo">075</span> return newAttr;<a name="line.75"></a>
<span class="sourceLineNo">076</span> }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span> /**<a name="line.78"></a>
<span class="sourceLineNo">079</span> * Add an attribute of the given type.<a name="line.79"></a>
<span class="sourceLineNo">080</span> */<a name="line.80"></a>
<span class="sourceLineNo">081</span> public Attribute addAttribute(String name) {<a name="line.81"></a>
<span class="sourceLineNo">082</span> Attribute attr = Attribute.create(name, this);<a name="line.82"></a>
<span class="sourceLineNo">083</span> getAttributesHolder().add(attr);<a name="line.83"></a>
<span class="sourceLineNo">084</span> return attr;<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span> /**<a name="line.87"></a>
<span class="sourceLineNo">088</span> * Clear all attributes from this entity.<a name="line.88"></a>
<span class="sourceLineNo">089</span> */<a name="line.89"></a>
<span class="sourceLineNo">090</span> public void clearAttributes() {<a name="line.90"></a>
<span class="sourceLineNo">091</span> Collection attrs = getAttributesHolder();<a name="line.91"></a>
<span class="sourceLineNo">092</span> Attribute attr;<a name="line.92"></a>
<span class="sourceLineNo">093</span> for (Iterator itr = attrs.iterator(); itr.hasNext();) {<a name="line.93"></a>
<span class="sourceLineNo">094</span> attr = (Attribute) itr.next();<a name="line.94"></a>
<span class="sourceLineNo">095</span> itr.remove();<a name="line.95"></a>
<span class="sourceLineNo">096</span> attr.invalidate();<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span> }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
<span class="sourceLineNo">101</span> * Remove all attributes with the given name from this entity.<a name="line.101"></a>
<span class="sourceLineNo">102</span> *<a name="line.102"></a>
<span class="sourceLineNo">103</span> * @return true if an attribute was removed, false otherwise<a name="line.103"></a>
<span class="sourceLineNo">104</span> */<a name="line.104"></a>
<span class="sourceLineNo">105</span> public boolean removeAttribute(String name) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> return removeAttribute(getAttribute(name));<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span> /**<a name="line.109"></a>
<span class="sourceLineNo">110</span> * Remove the given attribute. After being removed, the attribute<a name="line.110"></a>
<span class="sourceLineNo">111</span> * is invalid, and the result of any operations on it are undefined.<a name="line.111"></a>
<span class="sourceLineNo">112</span> *<a name="line.112"></a>
<span class="sourceLineNo">113</span> * @return true if the attribute was removed, false otherwise<a name="line.113"></a>
<span class="sourceLineNo">114</span> */<a name="line.114"></a>
<span class="sourceLineNo">115</span> public boolean removeAttribute(Attribute attribute) {<a name="line.115"></a>
<span class="sourceLineNo">116</span> if ((attribute == null) || !getAttributesHolder().remove(attribute))<a name="line.116"></a>
<span class="sourceLineNo">117</span> return false;<a name="line.117"></a>
<span class="sourceLineNo">118</span> attribute.invalidate();<a name="line.118"></a>
<span class="sourceLineNo">119</span> return true;<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span> /**<a name="line.122"></a>
<span class="sourceLineNo">123</span> * Convenience method to be called by BCEntities when being visited<a name="line.123"></a>
<span class="sourceLineNo">124</span> * by a {@link BCVisitor}; this method will allow the visitor to visit all<a name="line.124"></a>
<span class="sourceLineNo">125</span> * attributes of this entity.<a name="line.125"></a>
<span class="sourceLineNo">126</span> */<a name="line.126"></a>
<span class="sourceLineNo">127</span> void visitAttributes(BCVisitor visit) {<a name="line.127"></a>
<span class="sourceLineNo">128</span> Attribute attr;<a name="line.128"></a>
<span class="sourceLineNo">129</span> for (Iterator itr = getAttributesHolder().iterator(); itr.hasNext();) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> attr = (Attribute) itr.next();<a name="line.130"></a>
<span class="sourceLineNo">131</span> visit.enterAttribute(attr);<a name="line.131"></a>
<span class="sourceLineNo">132</span> attr.acceptVisit(visit);<a name="line.132"></a>
<span class="sourceLineNo">133</span> visit.exitAttribute(attr);<a name="line.133"></a>
<span class="sourceLineNo">134</span> }<a name="line.134"></a>
<span class="sourceLineNo">135</span> }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span> /**<a name="line.137"></a>
<span class="sourceLineNo">138</span> * Build the attribute list from the given stream.<a name="line.138"></a>
<span class="sourceLineNo">139</span> * Relies on the ability of attributes to read themselves, and<a name="line.139"></a>
<span class="sourceLineNo">140</span> * requires access to the constant pool, which must already by read.<a name="line.140"></a>
<span class="sourceLineNo">141</span> */<a name="line.141"></a>
<span class="sourceLineNo">142</span> void readAttributes(DataInput in) throws IOException {<a name="line.142"></a>
<span class="sourceLineNo">143</span> Collection attrs = getAttributesHolder();<a name="line.143"></a>
<span class="sourceLineNo">144</span> attrs.clear();<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span> Attribute attribute;<a name="line.146"></a>
<span class="sourceLineNo">147</span> String name;<a name="line.147"></a>
<span class="sourceLineNo">148</span> for (int i = in.readUnsignedShort(); i > 0; i--) {<a name="line.148"></a>
<span class="sourceLineNo">149</span> name = ((UTF8Entry) getPool().getEntry(in.readUnsignedShort())).<a name="line.149"></a>
<span class="sourceLineNo">150</span> getValue();<a name="line.150"></a>
<span class="sourceLineNo">151</span> attribute = addAttribute(name);<a name="line.151"></a>
<span class="sourceLineNo">152</span> attribute.read(in, in.readInt());<a name="line.152"></a>
<span class="sourceLineNo">153</span> }<a name="line.153"></a>
<span class="sourceLineNo">154</span> }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span> /**<a name="line.156"></a>
<span class="sourceLineNo">157</span> * Writes all the owned attributes to the given stream.<a name="line.157"></a>
<span class="sourceLineNo">158</span> * Relies on the ability of attributes to write themselves.<a name="line.158"></a>
<span class="sourceLineNo">159</span> */<a name="line.159"></a>
<span class="sourceLineNo">160</span> void writeAttributes(DataOutput out) throws IOException {<a name="line.160"></a>
<span class="sourceLineNo">161</span> Collection attrs = getAttributesHolder();<a name="line.161"></a>
<span class="sourceLineNo">162</span> out.writeShort(attrs.size());<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span> Attribute attribute;<a name="line.164"></a>
<span class="sourceLineNo">165</span> int length;<a name="line.165"></a>
<span class="sourceLineNo">166</span> for (Iterator itr = attrs.iterator(); itr.hasNext();) {<a name="line.166"></a>
<span class="sourceLineNo">167</span> attribute = (Attribute) itr.next();<a name="line.167"></a>
<span class="sourceLineNo">168</span> out.writeShort(attribute.getNameIndex());<a name="line.168"></a>
<span class="sourceLineNo">169</span> length = attribute.getLength();<a name="line.169"></a>
<span class="sourceLineNo">170</span> out.writeInt(length);<a name="line.170"></a>
<span class="sourceLineNo">171</span> attribute.write(out, length);<a name="line.171"></a>
<span class="sourceLineNo">172</span> }<a name="line.172"></a>
<span class="sourceLineNo">173</span> }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span> /**<a name="line.175"></a>
<span class="sourceLineNo">176</span> * Return the collection used to hold the attributes of this entity.<a name="line.176"></a>
<span class="sourceLineNo">177</span> */<a name="line.177"></a>
<span class="sourceLineNo">178</span> abstract Collection getAttributesHolder();<a name="line.178"></a>
<span class="sourceLineNo">179</span>}<a name="line.179"></a>
</pre>
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